When Montag gets home that first night after meeting her, he stands there, just pondering her face. The first image is that her face was very thin "like the dial of a small clock seen faintly in a dark room in the middle of the night ...all certainty and knowing what it had to tell of the night passing swiftly on toward further darknesses, but moving also toward a new sun." It is an interesting simile; a clock is steady, guiding, constantly moving forward into each new day, and cycling us onward. This could reflect the comfort that he feels from her, that he looks to her for a guide into the "further darkness"of a different life than his own, which is also "a new sun."

The second image of her face that Montag thiks of is that of "a mirror" because it took "of you and and throws back to you your own expression, your own innermost trembling thought." He feels that she, unlike anyone else he has known, has helped him to see himself for what he truly is, flaws and all. Her sensitivity to others allows them to assess where they are in life, and if it's where they want to be.

Any passage with Clarisse is filled with imagery and descriptive comparisons, and these are just two that Montag ponders.